TRIBE NYMPHACEA. 59 



smooth and rather small, orange yellow, pellucid, gaping at the 

 margin : hinge callous, palleal scar simple, f . — Mauritius." 



P. VioLACEA. Desk, in E. vol. 3. p. 852. — Solen V, Lam. 

 20. — Deles, t. 2.f. 5. Oblong, with the extremities rounded, an- 

 teriorly narrower, both within and without violet with paler rays ; 

 nymphae prominent : hinge with an obsolete tooth in one valve, in 

 the other a perfect and imperfect one. 3. — Indian Ocean, 



P. CosTATA. Nobis, in Z. P. 1842. Sub-elliptical, anteriorly 

 rather longer and angulated ; posteriorly narrowed and rounded at 

 the extremity : dnll, whitish, with livid rosy narrow rays, and most 

 irregular crowded coarse transverse ribs, which often so unite on 

 the anterior slope that one is formed from two : inside glossy pur- 

 plish or yellowish, the rays distinct, the nymphse purple. 1 .. 1|^. — 

 Australia. — Had not M. Deshayes assured us that the Virgata 

 of Lamarck was vierely a FerroensiSf we should have considered this 

 shell to have been that species. 



P. CosTULATA.* Turt. Biv. t. 6./. 8.— P. Discors. Phil. p. 23. 

 t. 3. f. 8. Oblong, posteriorly rounded and rather longer, an- 

 teriorly obtusely angulated, very thin, anterior slope only with radi- 

 ating grooves, elsewhere nearly smooth, white with interrupted 

 sub-radiating scarlet marks, and a short scarlet radiating streak 

 proceeding posteriorly a little distance from the beaks. ^..I. — 

 Sicily, ^'c. 



P. LiNROLATA. Gray in Yates New Zeal. Oblong, transverse, 

 compressed, obliquely truncated, anteriorly purplish rosy, with 

 rather darker concentric belts of very thin anastomosing radiating 

 lines, f . . 1 . — New Zealand. 



P. Variegata.— Solen V. Wood. G. C. t. 34./. 2. 3, A.—D. 

 p. 68. — W. t. 3. J". 32. Ovate-oblong, anteriorly rather longer, 

 sub-truncated, gaping ; thin, pellucid, rosy orange, with purple 

 rays, which are stronger anteriorly, nearly smooth: hinge with two 

 teeth in one valve, one in the other, g . . 1. 



P. Castrensis.— Solen, C. Cliem.f. 1935, 6,— Z>, /), 66.— TF. 

 t. 3.y. 25, Oval, rather longer and more obtuse anteriorly, very 



" This species belongs to the genus Galeomna, Turton, whose 

 characters are as follows : — 



GALEOMNA, 



Transverse, equilateral, equivalve, ventral margin widely gaping : 

 gape oval-oblong ; hinge toothless^ callous, with a small pit for 

 a sub-internal ligament tinder the beaks ; two vei-y small and 

 very distant muscular impressions : palleal scar simple. 

 G. TuRTONi,* Zool. Jour. vol. 2, t. 13, /, I.— Sow. G. f. I. 



2, 3. — Reeve, t. 54./. 1, 2, 3. Ovate-oblong, transverse, white, 



with very fine longitudinal waved striae ; hinge thickened, palleal 



scar simple and wrinkled. 



